#bgc {
    background-image: url(../images/sea.jpg);
}

h1 {
    /*text-align: center;*/
    margin-left: 160px;
}

#app {
    /*background-color: white;*/
    width: 450px;
    height: 480px;
    padding: 10px 50px 0 10px;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    border: 1px solid white;
}

button {
    width: 200px;
    height: 50px;
    display: block;
    margin-left: 140px;
    border: 2px solid #24b4fb;
    background-color: #24b4fb;
    border-radius: 0.9em;
    padding: 0.8em 1.2em 0.8em 1em;
    transition: all ease-in-out 0.2s;
    font-size: 16px;
}

button span {
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-weight: 600;
}

button:hover {
    background-color: #0071e2;
}